DowDupont – The chemical maker beat estimates by 3 cents a share, with adjusted quarterly profit of 74 cents per share. Revenue was slightly below forecasts, however. Its results were helped by strength in its cosmetics, paints, and packaging products. The company also announced a new $3 billion stock buyback program.

Newfield Exploration – Newfield agreed to be bought by Canadian oil and gas producer Encana in an all-stock deal valued at C$5.5 billion, or $4.2 billion in U.S. dollars. Encana plans to raise its dividend by 25 percent and expand its share buyback program once the deal closes.

Generac – The maker of home and commercial power generators beat consensus estimates by 35 cents a share, with adjusted quarterly profit of $1.43. Revenue also beat Wall Street forecasts. Generac saw strength in all its markets, as well as an increase in profit margins.

Tempur Sealy – The mattress retailer fell 16 cents short of estimates with adjusted quarterly profit of $1.02 per share, while revenue also missed Street forecasts. The company also cut its earnings forecast.

Hanesbrands – The apparel maker matched Street forecasts with adjusted quarterly profit of 55 cents per share, but revenue fell short of estimates. The company said overall performance was partly impacted by the Sears bankruptcy, but gave what it calls a "confident" outlook.

Roku – Wedbush upgraded the maker of streaming video devices to "outperform" from "neutral," saying a recent pullback in the stock was overdone and that it has built an exceptional platform to support its players.

Allstate – Allstate reported adjusted quarterly profit of $1.93 per share, shy of the $2.21 a share consensus estimate. The insurer's revenue came in above Street forecasts, however, and the company also announced a new $3 billion stock buyback plan.

Las Vegas Sands, Wynn Resorts — Shares in the casino operators may benefit from the news that gambling revenue in Macau rose 2.6 percent in October from a year earlier to about $3.4 billion, the highest monthly figure in four years. Gambling revenue in the Chinese territory has now risen for 27 straight months.